<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>letter-spacing</title>
    <style type="text/css">
        p.spread{
            letter-spacing: 30px;
            text-transform: uppercase;
        }
        p.tight{
            letter-spacing: -0.3em;
        }
    </style>
</head>
<body>
<p class="spread">dhy这是一个段落</p>
<p class="tight">这是一个段落</p>
</body>
</html>